GENERAL DESCRIPTION

The AK7754 is a highly integrated audio digital signal processor (DSP) with two Audio I/F’s, Microphone and

Headphone Amplifier. The audio DSP has 1536step/fs (at 48KHz sampling) parallel processing power, and AKM’s original Hands-free technology provides high performance noise and echo cancelling. The 96k-bit delay memory allows surround processing, acoustic effect and parametric equalizers. As the AK7754 is a RAM based DSP, it is programmable for user requirements.

FEATURES

□ DSP Block

- Word length: 24bit (Coefficient RAM& Data RAM: F24 floating point)

- Processing Speed: 13.6 ns (1536step/fs fs=48kHz;   9216step/fs fs=8kHz)

- Multiplication: 20 x 16 →36-bit Double precision arithmetic available

- Divider 20 / 20 →20bit

- ALU: 40bit arithmetic operation (overflow margin 4bit) 24bit floating point arithmetic and logic operation

- Program RAM: 2048 x 36bit

- Coefficient RAM: 2048 x 16bit (F24 floating point)

- Data RAM: 512 x 24-bit (F24 floating point)

- Offset Register: 32 x 12bit

- Delay RAM1: 3072 x 24bit 

- Delay RAM2: 2048 x 12bit

- Sampling rate: fs= 8.0k ~ 48kHz

- Master/Slave Operation

- Master Clock: 1536fs

  (generated from 32fs, 48fs, 64fs, 128fs, 256fs, 384fs by internal PLL)

□Two Digital Interfaces (I/F 1, I/F 2)

- Digital Signal Input Port (4ch) MSB justified 24bit/LSB justified 24/20/16bit and I2S

- Digital Signal Input Port (6ch) MSB justified 24bit/ LSB justified 20/16bit and I2S

- Short / Long Frame 

-24 bit linear, 8 bit A-law, 8 bit µ-law 

□ Stereo 24bit ADC Block

- Sampling rate: 8 ~ 48kHz

- ADC Characteristics S/(N+D): 82dB ,DR, S/N: 89dB

- Three Analog Input Selectors (Differential, Single-ended Inputs)

- Channel Independent MIC, Analog Line Gain Amp (0dB, 9dB~27dB, 3dBstep) 

- Channel Independent Digital Volume (24dB ~ -103dB, 0.5dB Step, Mute)

- Integrated DC offset canceling High Pass Filter

□ Digital Microphone I/F

□ Stereo 24bit DAC

- Sampling rate: 8 ~ 48kHz

- Digital Volume (12dB~-115dB, 0.5dB Step, Mute)

- Digital De-emphasis Filter (tc=50/15μs, fs=32kHz, 44.1kHz, 48kHz)

□Line Outputs

- Single-ended or Differential Outputs

- S/(N+D): 91dB ,DR, S/N: 96dB

- Stereo Analog Volume (+0 ~ -28dB, 2.0dB Step, Mute)

□ Stereo Headphone Amplifier with a Volume Control

- Rated Output Power: 27mW/ch @16Ω

- S/(N+D): 70dB , S/N: 89dB

- Stereo Analog Volume (+0 ~ -50dB,1.0/2.0/4.0dB Step, Mute)

- Click Noise Free at Power ON/OFF

□ SRC Block

- 2ch x 1 system

- Input Sampling Frequency: 8kHz ~ 96kHz 

- Output Sampling Frequency: 8kHz ~ 48kHz 

□ Analog Bypass Mode

- Bypass Amplifier (0dB~-21dB, 3dB step)

□ Output Mixer

□ μP Interface: I2C Bus (400KHz Fast-Mode)

□ Power Supply

  Analog AVDD: 3.0V ~ 3.6V (typ.3.3V)

  Digital1 DVDD: 3.0V ~ 3.6V (typ.3.3V)

  Digital2      DVDD18: 1.7V ~ 1.9V (typ.1.8V)

  HP-Amp HVDD: 3.0V ~ 3.6V (typ.3.3V)

□ Operating temperature range: -20°C ~ 85°C

□ Package: 48pin QFN (0.5mm pitch)